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Pages 70-76

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From page 70...
... 70 This chapter shows the state DOT how to evaluate its contribution in the watershed and the feasibility of potential BMPs. It provides considerations that state DOT practitioners can use to effectively implement compliance measures for a water body with a TMDL.
From page 71...
... Evaluating Watersheds and Best Management Practices 71 2. Assess feasibility of site conditions: Physical feasibility factors are used to determine viable locations and BMP types.
From page 72...
... 72 Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff • Multibenefit projects: Efforts by stakeholders that improve water quality and provide groundwater recharge or habitat enhancement through implementation of infiltrating or vegetated BMPs. Implementation of larger regional BMPs to address hydromodification and water quality.
From page 73...
... Evaluating Watersheds and Best Management Practices 73 Step 2. Assess Feasibility of Site Conditions This next step outlines a list of factors for state DOTs to analyze and consider when identifying a BMP location based on installation and maintenance feasibility.
From page 74...
... 74 Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff • Groundwater depth: Shallow depth of groundwater can prohibit the implementation of infiltrating BMPs due to contamination or impacts to the water table. Shallow groundwater depths can also pose a risk to structural stability.
From page 75...
... Evaluating Watersheds and Best Management Practices 75 is available in ESRI ArcView 9 with various geographic information systems data layers of the suitability criteria. The output from the BMP siting tool narrows areas that meet the user-specified criteria for the project site or selected BMP.
From page 76...
... 76 Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff Step 3. Prioritize Best Management Practice Selection This last step identifies the most critical factors to consider in BMP selection and implementation.

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